Endoscopic instrument

A medical device (10) comprising a handle (11), an end effector assembly (12), and a member (13) connecting the handle to the end effector assembly. The end effector assembly (12) comprises opposing jaw portions (83, 183) each including a plurality of teeth (84, 184). Each of the plurality of teeth includes a crest (88, 188), a root (89, 189), a first intermediate portion (90, 190) between the crest and the root, and a second intermediate portion (90, 190) between the crest and a root of an adjoining tooth, wherein surfaces of first intermediate portions contact surfaces of second intermediate portions of opposing jaw portions when the opposing jaw portions are in a closed configuration. The surfaces of the first intermediate portions and the surfaces of the second intermediate portions are transverse to a longitudinal axis of the jaw portions, and at least one root has a recessed portion (189, 289) configured to accommodate a tip (188) of the crest of an opposing tooth. A gap exists between the tip of the crest of the opposing tooth and a lowest point of the at least one root when the opposing jaw portions are in the closed configuration.